Revert of [profiler] Implement POC Sampling Heap Profiler

src/profiler/sampling-heap-profiler.h

-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef V8_PROFILER_SAMPLING_HEAP_PROFILER_H_
-#define V8_PROFILER_SAMPLING_HEAP_PROFILER_H_
-
-#include <deque>
-#include <map>
-#include <set>
-#include "include/v8-profiler.h"
-#include "src/heap/heap.h"
-#include "src/profiler/strings-storage.h"
-
-namespace v8 {
-
-namespace base {
-class RandomNumberGenerator;
-}
-
-namespace internal {
-
-
-class AllocationProfile : public v8::AllocationProfile {
- public:
-  AllocationProfile() : nodes_() {}
-
-  Node* GetRootNode() override {
-    return nodes_.size() == 0 ? nullptr : &nodes_.front();
-  }
-
-  std::deque<Node>& nodes() { return nodes_; }
-
- private:
-  std::deque<Node> nodes_;
-
-  DISALLOW_COPY_AND_ASSIGN(AllocationProfile);
-};
-
-class SamplingHeapProfiler : public InlineAllocationObserver {
- public:
-  SamplingHeapProfiler(Heap* heap, StringsStorage* names, uint64_t rate,
-                       int stack_depth);
-  ~SamplingHeapProfiler();
-
-  v8::AllocationProfile* GetAllocationProfile();
-
-  void Step(int bytes_allocated, Address soon_object, size_t size) override;
-  intptr_t GetNextStepSize() override {
-    return GetNextSampleInterval(random_, rate_);
-  }
-
-  StringsStorage* names() const { return names_; }
-
-  class FunctionInfo {
-   public:
-    FunctionInfo(SharedFunctionInfo* shared, StringsStorage* names);
-    explicit FunctionInfo(const char* name)
-        : name_(name),
-          script_name_(""),
-          script_id_(v8::UnboundScript::kNoScriptId),
-          start_position_(0) {}
-
-    const char* get_name() const { return name_; }
-    const char* get_script_name() const { return script_name_; }
-    int get_script_id() const { return script_id_; }
-    int get_start_position() const { return start_position_; }
-
-   private:
-    const char* const name_;
-    const char* script_name_;
-    int script_id_;
-    const int start_position_;
-  };
-
-  class SampledAllocation {
-   public:
-    SampledAllocation(SamplingHeapProfiler* sampling_heap_profiler,
-                      Isolate* isolate, Local<Value> local, size_t size,
-                      int max_frames);
-    ~SampledAllocation() {
-      for (auto info : stack_) {
-        delete info;
-      }
-      global_.Reset();  // drop the reference.
-    }
-    size_t get_size() const { return size_; }
-    const std::vector<FunctionInfo*>& get_stack() const { return stack_; }
-
-   private:
-    static void OnWeakCallback(const WeakCallbackInfo<SampledAllocation>& data);
-
-    SamplingHeapProfiler* const sampling_heap_profiler_;
-    Global<Value> global_;
-    std::vector<FunctionInfo*> stack_;
-    const size_t size_;
-
-    DISALLOW_COPY_AND_ASSIGN(SampledAllocation);
-  };
-
- private:
-  using Node = v8::AllocationProfile::Node;
-
-  Heap* heap() const { return heap_; }
-
-  void SampleObject(Address soon_object, size_t size);
-
-  static intptr_t GetNextSampleInterval(base::RandomNumberGenerator* random,
-                                        uint64_t rate);
-
-  // Methods that construct v8::AllocationProfile.
-  Node* AddStack(AllocationProfile* profile,
-                 const std::map<int, Script*>& scripts,
-                 const std::vector<FunctionInfo*>& stack);
-  Node* FindOrAddChildNode(AllocationProfile* profile,
-                           const std::map<int, Script*>& scripts, Node* parent,
-                           FunctionInfo* function_info);
-  Node* AllocateNode(AllocationProfile* profile,
-                     const std::map<int, Script*>& scripts,
-                     FunctionInfo* function_info);
-
-  Isolate* const isolate_;
-  Heap* const heap_;
-  base::RandomNumberGenerator* const random_;
-  StringsStorage* const names_;
-  std::set<SampledAllocation*> samples_;
-  const uint64_t rate_;
-  const int stack_depth_;
-};
-
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_PROFILER_SAMPLING_HEAP_PROFILER_H_